linux-kernel - Re: [WIP 1/3] rust: Introduce atomic module

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Message-ID: <497668ec-c2d5-4cb4-9c2d-8e6f7129a42e@lunn.ch>
Date: Sat, 23 Mar 2024 15:10:21 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Boqun Feng <boqun.feng@...il.com>, rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	llvm@...ts.linux.dev, Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrea Parri <parri.andrea@...il.com>,
	Will Deacon <will@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nicholas Piggin <npiggin@...il.com>,
	David Howells <dhowells@...hat.com>,
	Jade Alglave <j.alglave@....ac.uk>,
	Luc Maranget <luc.maranget@...ia.fr>,
	"Paul E. McKenney" <paulmck@...nel.org>,
	Akira Yokosawa <akiyks@...il.com>,
	Daniel Lustig <dlustig@...dia.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	kent.overstreet@...il.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, elver@...gle.com,
	Mark Rutland <mark.rutland@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Catalin Marinas <catalin.marinas@....com>,
	torvalds@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [WIP 1/3] rust: Introduce atomic module

On Sat, Mar 23, 2024 at 10:58:16AM +0100, Alice Ryhl wrote:
> On Sat, Mar 23, 2024 at 12:52 AM Andrew Lunn <andrew@...n.ch> wrote:
> >
> > > +//! These primitives should have the same semantics as their C counterparts, for precise definitions
> > > +//! of the semantics, please refer to tools/memory-model. Note that Linux Kernel Memory
> > > +//! (Consistency) Model is the only model for Rust development in kernel right now, please avoid to
> > > +//! use Rust's own atomics.
> >
> > Is it possible to somehow poison rusts own atomics?  I would not be
> > too surprised if somebody with good Rust knowledge but new to the
> > kernel tries using Rusts atomics. Either getting the compiler to fail
> > the build, or it throws an Opps on first invocation would be good.
> 
> We could try to get a flag added to the Rust standard library that
> removes the core::sync::atomic module entirely, then pass that flag.

Just looking down the road a bit, are there other features in the
standard library which are not applicable to Linux kernel space?
Ideally we want a solution not just for atomics but a generic solution
which can disable a collection of features? Maybe one by one?

And i assume somebody will try to use Rust in uboot/barebox. It
probably has similar requirements to the Linux kernel? But what about
Zephyr? Or VxWorks? Darwin?

	Andrew